<template>
  <div>
    <!-- 面包屑 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        :closable="false"
        :show-icon="true"
      >
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            class="cascader"
            v-model="selectedCateKeys"
            :options="cateList"
            :props="{ expandTrigger: 'hover', ...cateProps }"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            :disabled="isBtnDisable"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数的表格 -->
          <el-table :data="manyTableData" :border="true" :stripe="true">
            <!-- 展开列 -->
            <el-table-column type="expand">
              <!-- 循环渲染Tag标签 -->
              <template v-slot="{ row }">
                <el-tag
                  v-for="(item, index) in row.attr_vals"
                  :key="index"
                  closable
                  @close="handleClosed(index,row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="row.inputVisible"
                  v-model="row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(row)"
                  @blur="handleInputConfirm(row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template v-slot="{ row }">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  @click="showDeleteDialog(row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
            type="primary"
            :disabled="isBtnDisable"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性的表格 -->
          <el-table :data="onlyTableData" :border="true" :stripe="true">
            <!-- 展开行 -->
            <el-table-column type="expand">
              <!-- 循环渲染Tag标签 -->
              <template v-slot="{ row }">
                <el-tag
                  v-for="(item, index) in row.attr_vals"
                  :key="index"
                  closable
                  @close="handleClosed(index,row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="row.inputVisible"
                  v-model="row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(row)"
                  @blur="handleInputConfirm(row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template v-slot="{ row }">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  @click="showDeleteDialog(row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Params",
  data() {
    return {
      //商品分类列表
      cateList: [],
      //级联选择框的配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //级联选择框双向绑定到的数组
      selectedCateKeys: [],
      //被激活的页签名称
      activeName: "many",
      //动态参数的数据
      manyTableData: [],
      //静态属性的数据
      onlyTableData: [],
      //控制添加参数对话框显示与隐藏
      addDialogVisible: false,
      //控制修改参数对话框显示与隐藏
      editDialogVisible: false,
      //控制删除参数对话框显示与隐藏
      deleteDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {
        attr_name: "",
      },
      //修改参数的表单数据对象
      editForm: {},
      //删除参数的表单数据对象
      deleteForm: {},
      //添加参数的验证规则
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      //修改参数的验证规则
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      } else {
        this.cateList = res.data;
      }
    },
    //级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData();
    },
    //tab 页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData();
    },
    //获取参数的列表数据
    async getParamsData() {
      //证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.onlyTableData = [];
        this.manyTableData = [];
        return
      } else {
        //证明选中的是三级分类
        console.log(this.selectedCateKeys);
      }

      //根据所选分类的id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      );
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(",") : [];
        //控制文本框的显示与隐藏
        item.inputVisible = false;
        //文本框中输入的值
        item.inputValue = '';
      });
      console.log(res.data);
      if (this.activeName === "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },
    //监听对话框的关闭
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    //点击按钮，获取参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          return;
        } else {
          const { data: res } = await this.$http.post(
            `categories/${this.cateId}/attributes`,
            { attr_name: this.addForm.attr_name, attr_sel: this.activeName }
          );
          if (res.meta.status !== 201) {
            return this.$message.error("添加参数失败!");
          } else {
            this.$message.success("添加参数成功!");
            this.addDialogVisible = false;
            this.getParamsData();
          }
        }
      });
    },
    //点击按钮，展示修改的对话框
    async showEditDialog(attr_id) {
      //查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName },
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数信息失败!");
      } else {
        this.editForm = res.data;
        this.editDialogVisible = true;
      }
    },
    //重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    //点击按钮修改表单
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) {
          return;
        } else {
          const { data: res } = await this.$http.put(
            `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            {
              attr_name: this.editForm.attr_name,
              attr_sel: this.activeName,
            }
          );
          if (res.meta.status !== 200) {
            return this.$message.error("修改参数失败!");
          } else {
            this.$message.success("修改参数成功!");
            this.getParamsData();
            this.editDialogVisible = false;
          }
        }
      });
    },
    //点击按钮，展示删除的对话框
    async showDeleteDialog(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);

      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除!");
      } else {
        //删除的业务逻辑
        const { data: res } = await this.$http.delete(
          `categories/${this.cateId}/attributes/${attr_id}`
        );
        if (res.meta.status !== 200) {
          return this.$message.error("删除失败!");
        } else {
          this.$message.success("删除参数成功!");
          this.getParamsData();
        }
      }
    },
    //文本框失去焦点或摁下 Eenter 都会触发
    async handleInputConfirm(row) {
      if(row.inputValue.trim().length === 0) {
        row.inputValue = '',
        row.inputVisible = false;  
        return
      } else {
        row.attr_vals.push(row.inputValue.trim());
        row.inputValue = '';
        row.inputVisible = false;
      }
      //需要发起请求，保存这次操作
      this.saveAttrVals(row);

      
    },
    //将对 attr_vals 的操作，保存到数据库
    async saveAttrVals(row) {
      //需要发起请求，保存这次操作
      const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals:row.attr_vals.join(',')
      });

      if(res.meta.status !==200) {
        return this.$message.error('修改参数项失败!');
      } else{
        this.$message.success('修改参数项成功!');
      }
    },
    //点击按钮展示文本输入框
    showInput(row) {
      row.inputVisible = true;
      //让文本框自动获得焦点
      //$nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    //删除对应的参数可选项
    handleClosed(index,row) {
      row.attr_vals.splice(index,1);
      this.saveAttrVals(row);
    }
  },
  computed: {
    //如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisable() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      } else {
        return false;
      }
    },
    //当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      }
      return null;
    },
    //动态计算标题文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      } else {
        return "静态属性";
      }
    },
  },
};
</script>

<style scoped>
.cat_opt {
  margin: 15px 0;
}
.cascader {
  margin-left: 10px;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>